Small 50 rotor stator adjustment 

I’m glad you found it helpful.

You can use silicone spray lubricant as it will not dissolve the rubber.

Try form oil or even a lil mix of diesel and tranny fluid

The motor shaft that enters the reducer is helical. This toy cannot do more than 3000-4000 square meters of plaster because the pinions of the electric motor shaft wear out. I have bought 2 motor reducers so far. It is not an industrial machine and has very expensive costs. A gearmotor costs 2000 euros and does not last. I modified it, I installed a 2.2 kw industrial gear motor that I hope will last 100,000 square meters without interventions